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Posted to issues@hive.apache.org by "Soubhik Chakraborty (Jira)" <ji...@apache.org> on 2022/09/02 19:07:00 UTC

[jira] [Assigned] (HIVE-26514) Use ItemSketches in Filter and Join selectivity estimates for Strings

     [ https://issues.apache.org/jira/browse/HIVE-26514?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Soubhik Chakraborty reassigned HIVE-26514:
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> Use ItemSketches in Filter and Join selectivity estimates for Strings
> ---------------------------------------------------------------------
>
>                 Key: HIVE-26514
>                 URL: https://issues.apache.org/jira/browse/HIVE-26514
>             Project: Hive
>          Issue Type: Improvement
>          Components: Hive, Logical Optimizer
>            Reporter: Soubhik Chakraborty
>            Assignee: Soubhik Chakraborty
>            Priority: Major
>
> Introduce datasketches in the Filter and Join selectivity estimates. Right now  {{FilterSelectivityEstimator uses NDVs as its best guess to estimate selectivity for String columns with Equality and IN predicates.}}



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